Chain grate stoker



April 12, 1932. w, o, SPRmGER 1,853,092.

CHAIN GRATE STOKER Filed June 9, 1 926 INVENTOR ATTORNEYS Patented" Apr. 12,5 .1932 .l

warren ares ENT our s WELLIAIE' OBEN SPRINGER, BABBEETON, OHIO, ASSIGNOB, TO THE 1 BAIBGOCK & WILCOXCOMPANY, OF BAYONNE, NEW'J'ERSEY, A CORPORATIONOF NEW JERSEY CHAIN ena'rn' fs'roxnn Application filed. June 9, 1926. Serial No. 114,650.

This invention relates to chain grate stokers in which provision is made ior cooling the grate by an air blast and using the air thus heated for combustion purposes, and will be understood from the description in connection with the accompanying drawings,

in which Fig. 1 is a vertical section of an il-' lustrative, embodiment of the invention and Fig. 2 is a section along the 1111s 2-2 or Fig. 1.

In the drawings, reference character 5 in- I I dicates the iront wall and 6 the rear wall or a furnace that is brokenaway in Fig. 1. A

water tube 7, which may be connected to the boiler in the usual manner, is located above the rear end of a chain grate stoker, the upper run of the grate being shown at .8 and the lower, run at 9. This chain grate passes around front andrear sprocket wheels 10 and 11 or the usual sort, one of which may be grate, as this run passes over the "plates 13.

Similar I-beams 14 located below the I-beams 12 extend across the furnace below the lower run 970i the grate, and are provided with drag plates 15 along the upper edgesthereof, over passes. The I-beams 14 are mounted upon the foundationor base 16.

Metal plates 17 extend between the I-beams 12 and entirely close the spaces therebetween,

. so as to form an air-tight closure above the low the closure.- Baille lower run of the grate. The plates 17 may be connected to the I-beams 12 so that a considerable portion or the i beains extend beplates 18 are hinged or pivoted to the lower edges of the 'I-beams 12 with their lower ends bent outwardly, and

resting upon'the upper side of the lower run 9 of the chain grate. I between the last two I-beams 1 1inone side of the'furnace wall and leads to a fan 20, from which a pipe 21 carries the air to any desired place.

which the lower run of the grate An outlet 19 is located.

A-coal chute for feeding coal to the chain grate is shown at 22, and openings 28are provided below the coal chute for admitting cool air to the lower run of the grate.

The' operation is as follows: The chain grate is driven in the usual way, whereupon the upper run becomes heated and passes over the sprocket wheel 11, while cool air is drawn by means of the suction fan 20,

through the openings 23. This cool air con.-

tacts with the lower, r m 9,.passing between the links thereof and thence between the baiiies18 and I-beains, 14, as indicated by the.

arrows, in a direction countercurrent to the, travel of the lower run of the grate, and transversely across'its lower run, a plurality of times, as indicated becoming more andmoreheated until it passes out of the opening 19, and thence back into any convenient portion of the furnace where the heated air is used for combustion purposes. At the same time, the lower run of the chain grate becomes more and more cooled as it passes toward the r sprocket wheel 10, and when it passes thereover it is sufficiently cooled as the coalfrom the chute 22 is fed thereon. The cold air also removes heat from the lower edges of the I-beams 12, thus aiding in keeping the I-beams 12 at asufficiently low temperature to prevent the same from being. injured by the heat,

I claim:

1. In a chain grate stoker, an endless chain grate, and means for passing air for combustion purposes intocontact with the lower run of said grate and along the length of said run, and means to cause the air to 'cross said run a plurality of times, said lastnamed means comprising baffies. I

2; In a chaingrate stoker, an endless chain 1 grate, a closure disposed between the upper and lower runs of said grate, means for passe ing cooling air along said lower run, and a plurality of baftles adapted to cause said air the lower run of said grate disposed substantially beneath said first-named supports, a plurality of baflies disposed adjacent the upper supports, said closures and said baflles comprising means to guide air along said lower run.

4:. In a chain grate stoker, an endless chain grate, and means for causing air to pass a plurality of times back and forth through the lower run of the grate.

5. In a chain grate stoker, an endless chain grate having an upper and a lower run, members disposed transversely of the grate and engaging opposite sides of said lower run and arranged in offset relation to each other longitudinally of the grate, and means coacting with said members for causing air to flow generally longitudinally of said lower run and back and forth a plurality of times through said lower run between said members.

6. In a furnace, a chain grate stoker, means defining an air passage through which the lower run of the chain grate extends for substantially the entire length thereof, means for passing air through said passage, and means for causing the air to fiow back and forth through said lower run in a plurality of passes in flowing from one end of the passage to the other.

WILLIAM OREN SPRINGER. 

